<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<script type="text/javascript">
		var str = "hello World";
		alert(str.length);
		var strOne = "你若安好，我便是晴天";
		alert(strOne.length);
	</script>

</body>
</html>